4v^2-15=-9v

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Solution for 4v^2-15=-9v equation:


Simplifying
4v2 + -15 = -9v

Reorder the terms:
-15 + 4v2 = -9v

Solving
-15 + 4v2 = -9v

Solving for variable 'v'.

Reorder the terms:
-15 + 9v + 4v2 = -9v + 9v

Combine like terms: -9v + 9v = 0
-15 + 9v + 4v2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-3.75 + 2.25v + v2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 2.25v + 3.75 + v2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 2.25v + v2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 2.25v + v2 = 0 + 3.75
2.25v + v2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
2.25v + v2 = 3.75

The v term is 2.25v.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25v + 1.265625 + v2 = 3.75 + 1.265625

Reorder the terms:
1.265625 + 2.25v + v2 = 3.75 + 1.265625

Combine like terms: 3.75 + 1.265625 = 5.015625
1.265625 + 2.25v + v2 = 5.015625

Factor a perfect square on the left side:
(v + 1.125)(v + 1.125) = 5.015625

Calculate the square root of the right side: 2.239559108

Break this problem into two subproblems by setting 
(v + 1.125) equal to 2.239559108 and -2.239559108.

Subproblem 1

v + 1.125 = 2.239559108 Simplifying v + 1.125 = 2.239559108 Reorder the terms: 1.125 + v = 2.239559108 Solving 1.125 + v = 2.239559108 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + v = 2.239559108 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + v = 2.239559108 + -1.125 v = 2.239559108 + -1.125 Combine like terms: 2.239559108 + -1.125 = 1.114559108 v = 1.114559108 Simplifying v = 1.114559108

Subproblem 2

v + 1.125 = -2.239559108 Simplifying v + 1.125 = -2.239559108 Reorder the terms: 1.125 + v = -2.239559108 Solving 1.125 + v = -2.239559108 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + v = -2.239559108 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + v = -2.239559108 + -1.125 v = -2.239559108 + -1.125 Combine like terms: -2.239559108 + -1.125 = -3.364559108 v = -3.364559108 Simplifying v = -3.364559108

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.114559108, -3.364559108}

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